The first commit is failing on Arm and I think the fix should stop more
trailing comma issues which keep happening.

The second one I just noticed when looking at it. I don't feel strongly
about it so not sure if we should do it or not, but seems like the empty
metric-units exclusion from the JSON should be consistent if we're going
to have it at all.

Changes since v1:

  * Don't skip printing when the metric-unit string is empty but pass
    NULL instead of an empty string.

James Clark (2):
  perf stat: Fix trailing comma when there is no metric unit
  perf stat: Also hide metric-units from JSON when event didn't run

 .../tests/shell/lib/perf_json_output_lint.py  |  14 +-
 tools/perf/util/stat-display.c                | 182 ++++++++++--------
 2 files changed, 107 insertions(+), 89 deletions(-)

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2.34.1